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The douchebag index (DBI) is a statistic that yields the number of days since a person last bathed. It is found by multiplying the number of visible tattoos (VT) by the number of missing teeth (MT).

DBI = VT X MT
This dude's douchebag index is 27, meaning that he hasn't bathed in about four weeks. He has nine gross tattoos and three missing teeth.
by Duckbutt December 22, 2007
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Jul 29 Word of the Day
Someone who used to be a potential girlfriend/boyfriend, but no longer is.
Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...
by brownsuite September 24, 2011
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